self-similar
adjectiveUK /ˌself ˈsɪmɪlə/
US /ˌself ˈsɪmələr/
Something is self-similar when small parts of it look just like the whole thing.
A fern leaf is self-similar because each tiny piece looks like the whole leaf.
OTHER MEANINGS
2. In math, a shape or pattern that looks the same when you zoom in or out.
The Sierpinski triangle is self-similar at every level of zoom.
3. Having parts that copy the structure of the whole object.
The coastline showed self-similar features at many different scales.
4. Describing a system where smaller pieces repeat the same design as the larger one.
The branching of a tree is self-similar from trunk to twig.